I tested the package from your ppa, lightdm-gtk-greeter 1.1.5-0ubuntu1.2~test1, with lightdm 1.2.3-0ubuntu1 using the lightdm.conf below. It still did not auto-login. Anything else you need?
[SeatDefaults] autologin-user=liam autologin-user-timeout=1 greeter-session=lightdm-gtk-greeter user-session=ubuntu
I tested the package from your ppa, lightdm-gtk-greeter 1.1.5-0ubuntu1. 2~test1, with lightdm 1.2.3-0ubuntu1 using the lightdm.conf below. It still did not auto-login. Anything else you need?
[SeatDefaults] user-timeout= 1 session= lightdm- gtk-greeter
autologin-user=liam
autologin-
greeter-
user-session=ubuntu